642644460240 has 80 divisors (see below), whose sum is σ = 1992373152576. Its totient is φ = 171356774400.

The previous prime is 642644460197. The next prime is 642644460259. The reversal of 642644460240 is 42064446246.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 642644460192 and 642644460201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2761200 + ... + 2984880.

Almost surely, 2^642644460240 is an apocalyptic number.

642644460240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642644460240 is an abundant number, since it is smaller than the sum of its proper divisors (1349728692336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642644460240 is a wasteful number, since it uses less digits than its factorization.

642644460240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235668 (or 235662 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 642644460240 in words is "six hundred forty-two billion, six hundred forty-four million, four hundred sixty thousand, two hundred forty".